As a start, convert all three to polar form:Originally Posted by c00ky
i) This has the coordinates (2,5) in the Argand plane. Thus the "length" of this number is . The "angle" will be , so the polar form of 2 + j5 is approximately .
ii) -4 + j10 is approximately .
iii) -6 - j3 is approximatetly .
Multiply i) and ii). We are multiplying: , by the rules of exponents.
Division is similar: .